diff --git a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
index 450ac9f..42c3476 100644
--- a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
+++ b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
@@ -15,6 +15,7 @@ import java.util.stream.Collectors;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.Particle;
+import org.bukkit.World.Environment;
 import org.bukkit.block.Biome;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
@@ -22,9 +23,12 @@ import org.bukkit.block.data.Bisected;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Hoglin;
+import org.bukkit.entity.Piglin;
 import org.bukkit.util.BoundingBox;
 import org.bukkit.util.Vector;
 
+import com.google.common.base.Enums;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.Multimap;
 
@@ -320,6 +324,7 @@ public class BiomeRecipe implements Comparable<BiomeRecipe> {
                 .map(m -> {
                     Entity entity = b.getWorld().spawnEntity(spawnLoc, m.getMobType());
                     if (entity != null) {
+                        preventZombie(entity);
                         return addon
                                 .getManager()
                                 .getMap()
@@ -338,6 +343,31 @@ public class BiomeRecipe implements Comparable<BiomeRecipe> {
 
     }
 
+    /**
+     * Prevent hoglins and piglins from zombifying if they spawn in the overworld
+     * @param entity - spawned entity
+     */
+    private void preventZombie(Entity entity) {
+        if (!entity
+                .getWorld()
+                .getEnvironment()
+                .equals(Environment.NORMAL) ||
+                !Enums.getIfPresent(EntityType.class, "PIGLIN")
+                .isPresent()) {
+            return;
+        }
+
+        if (entity instanceof Piglin) {
+            Piglin p = (Piglin)entity;
+            p.setImmuneToZombification(true);
+            return;
+        }
+        if (entity instanceof Hoglin) {
+            Hoglin h = (Hoglin)entity;
+            h.setImmuneToZombification(true);
+        }
+    }
+
     /**
      * @return a mob that can spawn in the greenhouse
      */
diff --git a/src/test/java/world/bentobox/greenhouses/greenhouse/BiomeRecipeTest.java b/src/test/java/world/bentobox/greenhouses/greenhouse/BiomeRecipeTest.java
index 190f2d1..e5d9909 100644
--- a/src/test/java/world/bentobox/greenhouses/greenhouse/BiomeRecipeTest.java
+++ b/src/test/java/world/bentobox/greenhouses/greenhouse/BiomeRecipeTest.java
@@ -20,6 +20,7 @@ import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.Particle;
 import org.bukkit.World;
+import org.bukkit.World.Environment;
 import org.bukkit.block.Biome;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
@@ -29,6 +30,8 @@ import org.bukkit.block.data.BlockData;
 import org.bukkit.entity.Cat;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Hoglin;
+import org.bukkit.entity.Piglin;
 import org.bukkit.scheduler.BukkitScheduler;
 import org.bukkit.util.BoundingBox;
 import org.bukkit.util.Vector;
@@ -126,6 +129,8 @@ public class BiomeRecipeTest {
         // Settings
         when(addon.getSettings()).thenReturn(settings);
         when(settings.isStartupLog()).thenReturn(true);
+        // World
+        when(world.getEnvironment()).thenReturn(Environment.NORMAL);
 
         // Set up default recipe
         br = new BiomeRecipe(addon, type, 0);
@@ -443,6 +448,7 @@ public class BiomeRecipeTest {
         // Same box as greenhouse
         when(cat.getBoundingBox()).thenReturn(bb);
         when(world.spawnEntity(any(), any())).thenReturn(cat);
+        when(cat.getWorld()).thenReturn(world);
 
 
         br.addMobs(mobType, mobProbability, mobSpawnOn);
@@ -469,7 +475,7 @@ public class BiomeRecipeTest {
         BoundingBox small = new BoundingBox(11, 101, 11, 19, 119, 19);
         when(cat.getBoundingBox()).thenReturn(small);
         when(world.spawnEntity(any(), any())).thenReturn(cat);
-
+        when(cat.getWorld()).thenReturn(world);
 
         br.addMobs(mobType, mobProbability, mobSpawnOn);
         assertTrue(br.spawnMob(block));
@@ -477,6 +483,92 @@ public class BiomeRecipeTest {
         verify(location).add(any(Vector.class));
     }
 
+    /**
+     * Test method for {@link world.bentobox.greenhouses.greenhouse.BiomeRecipe#spawnMob(org.bukkit.block.Block)}.
+     */
+    @Test
+    public void testSpawnMobHoglin() {
+        when(block.getY()).thenReturn(10);
+        when(block.getType()).thenReturn(Material.GRASS_PATH);
+        when(block.getRelative(any())).thenReturn(block);
+
+        EntityType mobType = EntityType.HOGLIN;
+        int mobProbability = 100;
+        Material mobSpawnOn = Material.GRASS_PATH;
+
+        Hoglin hoglin = mock(Hoglin.class);
+        // Exactly 1 block smaller than the greenhouse blocks
+        BoundingBox small = new BoundingBox(11, 101, 11, 19, 119, 19);
+        when(hoglin.getBoundingBox()).thenReturn(small);
+        when(hoglin.getWorld()).thenReturn(world);
+        when(world.spawnEntity(any(), any())).thenReturn(hoglin);
+
+
+        br.addMobs(mobType, mobProbability, mobSpawnOn);
+        assertTrue(br.spawnMob(block));
+        verify(world).spawnEntity(eq(location), eq(EntityType.HOGLIN));
+        verify(location).add(any(Vector.class));
+        verify(hoglin).setImmuneToZombification(true);
+    }
+
+    /**
+     * Test method for {@link world.bentobox.greenhouses.greenhouse.BiomeRecipe#spawnMob(org.bukkit.block.Block)}.
+     */
+    @Test
+    public void testSpawnMobPiglin() {
+        when(block.getY()).thenReturn(10);
+        when(block.getType()).thenReturn(Material.GRASS_PATH);
+        when(block.getRelative(any())).thenReturn(block);
+
+        EntityType mobType = EntityType.PIGLIN;
+        int mobProbability = 100;
+        Material mobSpawnOn = Material.GRASS_PATH;
+
+        Piglin piglin = mock(Piglin.class);
+        // Exactly 1 block smaller than the greenhouse blocks
+        BoundingBox small = new BoundingBox(11, 101, 11, 19, 119, 19);
+        when(piglin.getBoundingBox()).thenReturn(small);
+        when(piglin.getWorld()).thenReturn(world);
+        when(world.spawnEntity(any(), any())).thenReturn(piglin);
+
+
+        br.addMobs(mobType, mobProbability, mobSpawnOn);
+        assertTrue(br.spawnMob(block));
+        verify(world).spawnEntity(eq(location), eq(EntityType.PIGLIN));
+        verify(location).add(any(Vector.class));
+        verify(piglin).setImmuneToZombification(true);
+    }
+
+    /**
+     * Test method for {@link world.bentobox.greenhouses.greenhouse.BiomeRecipe#spawnMob(org.bukkit.block.Block)}.
+     */
+    @Test
+    public void testSpawnMobPiglinNether() {
+        when(world.getEnvironment()).thenReturn(Environment.NETHER);
+
+        when(block.getY()).thenReturn(10);
+        when(block.getType()).thenReturn(Material.GRASS_PATH);
+        when(block.getRelative(any())).thenReturn(block);
+
+        EntityType mobType = EntityType.PIGLIN;
+        int mobProbability = 100;
+        Material mobSpawnOn = Material.GRASS_PATH;
+
+        Piglin piglin = mock(Piglin.class);
+        // Exactly 1 block smaller than the greenhouse blocks
+        BoundingBox small = new BoundingBox(11, 101, 11, 19, 119, 19);
+        when(piglin.getBoundingBox()).thenReturn(small);
+        when(piglin.getWorld()).thenReturn(world);
+        when(world.spawnEntity(any(), any())).thenReturn(piglin);
+
+
+        br.addMobs(mobType, mobProbability, mobSpawnOn);
+        assertTrue(br.spawnMob(block));
+        verify(world).spawnEntity(eq(location), eq(EntityType.PIGLIN));
+        verify(location).add(any(Vector.class));
+        verify(piglin, never()).setImmuneToZombification(true);
+    }
+
     /**
      * Test method for {@link world.bentobox.greenhouses.greenhouse.BiomeRecipe#spawnMob(org.bukkit.block.Block)}.
      */